package com.wgz.flag.service;

import com.wgz.flag.domain.dto.GroupMessageDTO;
import com.wgz.flag.domain.vo.GroupMessageVO;
import java.util.List;

public interface GroupMessageService {
    GroupMessageVO sendMessage(Long senderId, GroupMessageDTO messageDTO);
    List<GroupMessageVO> getMessageHistory(Long groupId, Long lastMessageId);
    void recallMessage(Long messageId, Long operatorId);
}